Demographic characteristics of admitted patients and time of arrival at the emergency department
| Patient characteristics | Mean | Median (IQR) |
| Previous emergency admissions | 0.94 | 1 (0–2) |
| Previous ED attendances | 2.22 | 2 (1–3) |
| Elixhauser Comorbidity Index (vWs) | 2.76 | 0.5 (0–5) |
| Age (years) | 50.27 | 55 (25–75) |
| Time in ED (min) | 291 | 234 (185–342) |
| Four-hour breach rate in ED at the patient’s time of arrival | 38% | 37% (18%–56%) |
| Number | Percentage | |
| Male | 2 524 541 | 48% |
| Female | 2 725 350 | 52% |
| Number | Percentage | |
| Deprivation decile | ||
| 0 (deprivation unknown) | 52 384 | 1% |
| 1 (least deprived) | 369 831 | 7% |
| 2 | 448 792 | 9% |
| 3 | 461 779 | 9% |
| 4 | 478 846 | 9% |
| 5 | 502 621 | 10% |
| 6 | 523 041 | 10% |
| 7 | 545 037 | 10% |
| 8 | 576 244 | 11% |
| 9 | 614 493 | 12% |
| 10 (most deprived) | 676 823 | 13% |
| Hour of attendance | ||
| 00:00-05:59 | 611 073 | 12% |
| 06:00-11:59 | 1 268 524 | 24% |
| 12:00-17:59 | 1 898 281 | 36% |
| 18:00-23:59 | 1 472 013 | 28% |
| Month of attendance | ||
| January to March | 1 485 052 | 28% |
| April to June | 1 158 860 | 22% |
| July to September | 1 226 749 | 23% |
| October to December | 1 379 230 | 26% |
| Year of attendance | ||
| 2016 | 1 654 846 | 32% |
| 2017 | 2 700 055 | 51% |
| 2018 | 894 990 | 17% |
Total number of patients = 5 249 891.
Of a total of 5 254 605 individual patients, 4714 (0.09% of patients) were excluded at this stage because of missing age or gender.
ED, emergency department; vW, summary score developed by van Walraven.18